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- W2059460368 abstract "Abstract An approximation for systems of interacting fermions which goes beyond the standard thermal Hartree-Fock approximation (THFA) is developed on the basis of the variational principle of statistical mechanics. The new approximation consists of choosing the “best” trial Hamiltonian such that all its eigenstates are single determinants whose occupied states are chosen from some (“best”) complete set of orthonormal one-particle states. This thermal single-determinant approximation (TSDA) is a natural extension to nonzero temperature of the Hartree-Fock approximation for the ground state; it is different, and in a well-defined sense better, than the standard THFA. Various modifications of the TSDA, which are variational, are also defined and the relationship between the TSDA and the THFA is discussed." @default.
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- W2059460368 date "1975-07-01" @default.
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- W2059460368 title "Theory of the thermal single-determinant approximation" @default.
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- W2059460368 doi "https://doi.org/10.1016/0003-4916(75)90263-8" @default.
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